In SEM investigations of various members of the family Aizoaceae, it was possible to demonstrate the presence of nectar slits over nectar glands in strict correlation; nectaries are therefore mesophyllous, glands lack any intercellular spaces, and exudation of nectar occurs through the slits. Based on these results, a revised classification of nectaries for Aizoaceae is offered, and the presence of nectaries in the genus Glottiphyllum can be shown.